William Carlos Stone (October 9, 1859 – February 23, 1939) was a philatelist who specialized in the collection of philatelic literature related to revenue stamps and postal stationery.

Stone collected and studied United States revenue stamps, and, at the same time, accumulated a large library consisting mostly of philatelic literature related to revenue stamps.

He assisted his fellow philatelist William Reynolds Ricketts in the preparation of Ricketts' famous index of philatelic literature.

Stone was named to the American Philatelic Society Hall of Fame in 1947.

[1] Stone's collection of revenue stamp philatelic literature was sold in 1939 to George Townsend Turner, who later donated it to the Smithsonian Institution where it now resides in the National Postal Museum in Washington, D.C.